Machine fob treating- bubbeb and similar material



0. R. BOWEN AND 0. F. SCHNUCK. MACHINE FOR TREATlNG RUBBER AND SIMILARMATERIAL.

APPLICATION FILED SEPT-2|. 1917- RENEWED AUG. 31. 1920- 1,357,948Patented Nov. 9, 1920..

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n. R. BOWEN AND 0. F. SCHNUCK.

MACHINE FOR TREATING RUBBER AND SIMILAR MATERIAL.

Patented Nov. 9, 1920. I 2 SHEETS-SHEET 2.

APPLICATION FILED SEPT.2I| 1917- RENEWED AUG. 3 I920.

UNITED STATES PATENT oFETc CUT, ASSIGNOZRS- TO FABREL FOUNDRY ANDMACHINE COMPANY, OF ANSONIA, CONNECTICUT, A CORPORATION. OF CONNECTICUT.

MACHINE FOR- TREATING R'C'BIBER AND SIMILAR MATERIAL.-

Specification of Letters Patent.

Patented Nov. 9, 1920.

Application filed September 21 1917,.Seria1 No. 192,619. Renewed August31, 1920. Serial No. 407,220.

To all 2072 0m it may concern Be it known that we, DAVID R. Bowen andCARL F. SCHNUCK, both citizens of the United States, and the firstresiding in Ansonia, county of New Haven, andthe second residing in NewHaven, county of New Haven, State of Connecticut, have invented certainnew and useful Improvements in Machines for Treating Rubber and SimilarMaterial, of which the following is a full,

clear, and exact description.

This invention relates to machines for mixing, working or masticatingrubber or similar material, and ithas particular refer-' ence to amachine formixingrubber chunks of various sizes with filling or coloringmaterial in powdered form so as to obtain a thoroughly smooth resilientmass whichis homogeneous.

One of the primary objects ofthe present invention is the provision of avery simple, compact and economical form of mixer, in which the chargingof the mixing chamber and the discharging thereof both take place at thelower part of said chamber.

Another object of our invention is to furnish a machine of the typeindicated, in which the fluid pressure mechanism 7 for actuating thepressure piston or ram is located at the top of the machine, whereas thepiston or ram itself is located at the under part of the machine. Such aconstruction has the advantage that the piston or ram can act as adischarge controlling door as well as a charging device, while at thesame time the fluid pressure actuating mechanism is readily accessible,the total hei ht of the machine being comparatively-small To these andother ends, the invention consists in the novel features, parts-andcombinations of parts to be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a front elevation of a. mixingmachine embodying our improvements;

Fig. 2 is a vertical, transverse section of the machine and Fig. 3 is atop plan view of the upper part of the machine.

The particular-machine selected for 1llus tration comprises-pedestals orend frames 5 adapted to be bolted to the floor. Between the pedestals attheir upper ends is located a mixing chamberfi approximately cylindrilarly to the working cylinder.

- intermediate portion of the cylinder through which the material isextruded alternately in opposite directions by the blades, substantiallyas described in our application,

Serial No. 191,413. However, so far as the present invention isconcerned, the form of the rotor and thecharacter of the cooperationbetween it and the chamberare not I111", portant, as the inventionconcerns itself primarily with the means, for charging and dischargingthe mixing chamber. 6;

r The lower chamber section 10 has its lower portion formed as anupright cylinder 11 communicating with the working cylinder at theunderportion thereof, preferably substantiallythroughout the length ofthe cylin der. The portion 11 acts as a charging and dischargingcylinder for the machine, it being in this instance located perpendicu-Operating in the charging anddischarging cylinder is a pressure pistonor ram 12, which is adapted to be raisedand lowered by suitable fluidpressure, mechanism located on top of the working chamber. 1 I

In the particular example shown, the piston 12 is connected at itslowerend with a DAVID R. BOWEN, ANSONIA, AND CARL F. SCHNUCK, OF NEW HAVEN,CONNEC'II- plate 13, to whichvertical guide rods 14; are

attached at the corners, said rods being vertically guided in guides 15at the corners of the working chamber, These rods extend 'above theworking. chamberand are con nected at their upper ends witha plate 14*"similar to the plate 13. The plate 14* has a depending piston rod 15aflixed thereto, on the lower end of which is a piston 16, working in anupright cylinder 17 mounted on -ering the piston 16 in said cylinder.When the piston 16, is rai-sed, 1t carries upward top of the workingchamber. The cylinder the pressure piston or ram 12 at the lower part ofthe machine through the connections described, whereby the piston 12 israised in the cylinder 11.. On the other hand, when the piston 16occupies its lowermost position, as shown in Fig. 2, the pressure pistonor ram 12 occupies its lowermost position, the greater part of theinterior of cylinder 11 being then free and unobstructed.

The cylinder 11 is provided in its side wall, at what may be termed thefront of the machine, with a charging and discharging opening 20. Thisopening is located about midway of the height of the cylinder, thearrangement being such that when the pressure piston is lowered, it willpass down beyond the lower edge of said opening. Material can then becharged into the cylinder 11 through the opening, so that it will reston top of the piston 12, and by suitably ac tuating the fluid pressurepiston the mate rial can be carried upward into the working chamberfi.Before this is done, however, the charging opening must be'closed toprevent the escape of material through. said opening under the pressureof the piston, and for this-purpose a suitable closure, such as aswinging door 21, is provided for said opening. In the particular formshown, the door 21 is hinged-at one side to the body of the cylinder andat the opposite side itis adapted to be locked in the closed position byoppositely acting locking bolts 22 actuated by a hand wheel 23. It willbe under stood, of course, that'the inner surface of the door conformsto the curvature of the piston 12, so that there will be no leakage pastthe piston. The latter will also preferably be provided with suitablepacking as shown.

It will be observed that the upper end of the pressure piston 12 isconcave in crosssection as shown in Fig. 2, thereby presenting asubstantially cylindrical surface, which supplements the inner surfaceof cylinder 6. In other words, the cylinder 6 inconjunction with piston12 forma substantially complete hollow cylinder. The piston 12 not onlycarries the material upward into the working chamber, but it holds ittightly in contact with the blades of the rotor so that the latteroperate on it in a very effective way. The arrangement will preferablybe such that while the upper end of the pistonwill move into quitecloseproximity to the rotating blades, it will notbe possible for it toactually make con tact with said blades.

When it is desired to discharge the machine, the mixing operation havingbeen completed,the piston 12 is lowered again to the position shown inFig.2. The door 21 is then released and opened and thetreated materialis taken out of the cylinder 11.

'of masticating rubber or similar material from the scope of ourinvention as defined in the claims.

We do not claim broadly herein a rubber mixing machine comprising aworking chamber having an opening in the lower portion thereof, and acharging and discharging device operating in said opening, as claimed inour application Serial No. 192,030; nor do we claim herein a rubbermixer comprising a working chamber having an intermediate extrusion rib,as claimed in our application, Serial No. 191,413. Furthermore we-do notclaim herein the method which comprises subjecting the mass to a mixingextrusion action, as claimed in our application, Serial No. 223,537.

In referring to a charging or discharging cylinder we employ the term ina broad sense, as it will be obvious that the crosss ection of thecharging device used for this purpose can be otherthan round withoutaffecting the principle of the invention in any way.

lVhat we claim is:

1. In a machine of the charz-icter described. a working chamber havingan opening at the lower part thereof, a rotary mixing element in saidchamber, a movable member adapted to close said opening, andpower-operated. means located above the working chamber for exertingpressure on said member and thereby shifting it into a position whereinit holds the material in contact with said mixing element.

2. In amachine of the character described, amixing chamber having anopening in the lower part thereof, a rotary mixing element in saidchamber, a piston insaid opening to charge the material and permit thedischarge thereof, and fluid pressure means located above the mixingchamber for actuating said piston.

3. In a machine of the character described, a working chamber,a secondchamber communicating therewith, and a piston in said second chamberhaving a concave face dis posed toward the interior of the workingchamber.

4. In machine' of the characterdescribed, a mixing chamber having anopening in the lower part thereof, a cylinder in communicationwithsaidmpening, and a piston in said'cylinder having aconcave upperface. 130

5; In a machine of the character described, a mixing chamber having anopening in the lower part thereof, a cylinder communicating with saidopening, a rotor in said chamher, a piston in said cylinder having aconcave face adapted to hold the material against sa id rotor, and meansfor actuating said piston.

6. In a machine of the character described, a mixing chamber having anopening in its periphery, a cylinder communicating with said opening, arotor in said chamber, and a piston in said cylinder having a curvedface to hold the material in contact with said rotor.

7. In rubber mixing machine of the single cylinder type, a mixingcylinder having an opening in its periphery, a second cylindercommunicating with the first by way of said opening and arrangedradially with respect to said mixing cylinder, a rotor in said mixingcylinder, and a piston in said second cylinder for holding the materialin contact with said rotor, said piston having its face conforminggenerally to the curvature of said mixing cylinder.

8. In a rubber working machine, a working chamber, a pressure pistonbeneath the same, and actuating means for said piston located above saidworking chamber.

9. In a rubber mixing machine, a working chamber, a rotor therein, anupwardly moving pressure piston in the lower part of the chamber, and afluid pressure piston and cylinder for actuating said first piston,lorated above said working chamber.

10. In a rubber mixer, a working chamber, a pressure piston, arrangedtransversely thereto and adapted to be moved into proximity to theperiphery of said chamber, and operating means for said pressure pistonlocated at an opposite point in the chamber periphery.

11. In a rubber mixer, a working chaming chamber, a cylinder and pistonfor feed- 7 ing the material into said chamber in a generally upwarddirection, and an actuate ing cylinder and piston for said first pistonlocated at the opposite sideof the working chamber.

14. In a rubber mixing machine, a working chamber, a cylinder and pistonfor feeding the material into said chamber in a genorally upwarddirection, and an actuating cylinder and piston for said first pistonsupported on top of the working chamber. 15. A rubber mixing machinehaving a pressure piston or ram shaped to conform to and supplement theconformation of the main mixing chamber-in which the rotor is located,substantially as described.

16. A rubber mixing machine, having a pressure piston arrangedtransversely to the working chamber in which the rotor is located, andadapted to be moved into proximity to the periphery of the rotor, saidpressure piston being shaped to conform to and to supplement theconformation of the working chamber, suitable operating means beingprovided for said pressure piston at the opposite side of the chamber.

In witness whereof we have hereunto set our7hands onthe 18th day ofSeptember, 191 7 DAVID R. BOWEN. CARL r. SGHNUCK.

